Sifter box and sifter unit therefor



March 15, 1960 R. L. HOFFMAN 2,928,577

SIFTER BOX AND SIFTER UNIT TI'EREFOR Filed July 14, 1958 FIG.l

IN VENTOR.

ROBERT L. HOFF MAN ATTOR NEY f... ...s therefor.

`llniteci tates Patent SIFIER BOX AND slFTER UNIT THEREFOR Robert L. Holman, Tuckahoe, N.Y., assignor to Cross Paper Products Corp., New York, N.Y., a corporation of New York Application July 14, 1958, Serial` No. 748,296

8 Claims. (Cl. 222-555) This invention relates to a ster box andsifterunit One object of Vthis invention is to generally improve the construction shown in United States Patent No. 2,480,096.

A further object of this invention is to provide in a device of the character described, a highly improved sifter unit comprised of three sheets or layers of superimposed cardboard attached together, the top cardboard layer having a central circular opening, the middle cardboard layer having a central circular opening larger than the opening in the top cardboard layer, and the bottom cardboard layer having a small opening eccentric with respect to the first two mentioned openings, and a circular valve disk rotatable ink the opening of the middle cardboard layer and being disposed between the top and bottom cardboard layers, and being formed with a plurality of small outlet openings adapted to register with the opening in the bottom cardboard layer, in one angular position of the valve disk.

Another object of this invention is to provide in a sifter unit of the character described, a paper sheet attached to the top surface of the bottom cardboard layer and on which the rotary valvedisk lies, said paper sheet being formed with an opening registering with theopening in the bottom cardboard layer.

Another object of this invention is to provide a highly improved sifter box of the character described, said sifter comprising a sifter unit tted within one end of a tube and engaging an inwardly rolled end. edge of said tube, and said sifter unit being held in place against the rolled end edge of said tube by an inner tubertelescoped within thev lirst tube and having an Vend edge contacting the underside of the sifter unit.

Yet another object of this invention is to provide a sifter unit of the character described, which is oval in shape and in which the circular opening is centrally 1o.

cated, and in which the valve disk is formed with a diametric ridge projecting upwardly through the opening in thetop cardboard layer so that it may be engaged by the fingers` for rotating the disk.

Yet another object of this invention is to provide a strong, rugged and durable sifter box construction and sitter unit therefor, which shall be relatively inexpensive to manufacture Vand, yet ,practical and eicient to a high degree and use. y

Other objects of this invention will in part be obvious and in part hereinafter pointed out.

The invention accordingly consists in the features of construction, combinations of elements, and arrangement of parts, which will be exemplified in the construction hereinafter described, and of which the scope of invention will' be indicated in the following claims.

A in the accompanying drawings in which is shown varlious illustrative embodiments of this invention,

Figi is a front elevational view of a sitter box embodying the invention,

Fig. 2 is a top planview thereof,

Vilar outer outlines.

Fig. 3` is a cross-sectional view takenv along line 3-3' of Fig. 2, Y

Fig. 4 is a cross-sectional view taken alongv line 4--4 of Fig. 3.

Fig. 5 is a cross-sectional view taken along linevr 5-5 o-f Fig. 1, and .Y Y

Fig. 6 is a partial view similar to Fig. 3, but showing the valve disk in a different angular position.

Referring now in detail to the drawing, 10 designates a sifter box embodying the invention. .A The same comprises an outer'case 1I. Said case 11 comprises an outer casewall 12 of oval transverse cross-section having-an inwardly rolled. lower edge ange 1'3 and an upper end edge 14. Mounted within the casewall 12, and resting on the lower end edge 13, is a bottom wall 15 which. may be press-fitted invplace or glued, as desired-.1

Slidable within th outer case 11 is an inner caseV 16;. The inner case 16 comprises an outer tubular wall 17., likewise of oval cross-section and telescoped within` the tubular wall 12; Wall 17 has a lower end edge 18v resting on the bottom wall 15. Wall 17 has an upper in.- wardly rolled end edge flange 19 spaced above the upper edge 14 of wall 12. Telescoped within wall 17 is a wall 20, likewise of oval cross-section. WallV 20v has a lower end edgey 21 likewise resting on thevr upper surface of the bottom wall =1S. VThe upper end 2210i wall 20 is spaced below the upper inwardly rolled edge 19 of tur bular wall 17. Y

Mounted within the upper end of the wall 17, and between the upper edge 22. of wall 20 and the inwardly rolled edge 19 of wall 17,l is a sifter unit 25. Said sifter unit 25 comprises a bottom cardboard layer 26, a top cardboard layer 27 and a. middle or intermediate cardboard layer 28. These are superimposed and have sim- They have` oval-shaped 'outer pe ripheries contacting the inner surface of wall 17.y The top layer 27 is formed. with a central cut-Out Opening 27a. The intermediate layer 28 isformed with a central cutout opening 28a larger than the opening 27a. The bottom layer 26 is formed' with an. eccentric smaller cut-out or opening 26a, offset from the center of the openings 27a and 28a. Glued, or otherwise adhered to the upper surface of the bottom cardboard' layer 26 is a thin sheet 30 formedfwith an opening 30a registering with the opening 26a. Rotatively mountde on the paper sheet 30, and between the said paper sheet and the upper cardboard layer 27', is a rotary valve diskmember 31 which may be made of' synthetic plastic material. The inner periphery of opening 27a of ,top layer 27 overlaps the outer peripheryv of the'disk 31. `The disk 31 substantially has the same thickness as the intermediate layer 28. Said disk 31 is formed with a centraltransvers diametric upwardly extending ridge 32 projecting through the opening 27a. The ridge 32' may be grasped by the ngers of the operator for rotating the disk.

Said disk 31 is formed with a plurality o f small spaced openings 33. Four'such openings 33 are shown in uthe drawing, although any suitable number may be provided. All of the openings 33 are, however, within a circular outline having diameter equal to the diameter ofthe opening 26a. In the closed' position of the box Vshown in IFigs. 2, 3 and 5, the openings 33 are offset from the openings 30a and 26a so that powder material within the box cannot be sifted through. Howevenupon rotating the disk 30 to the position shown inFg. 6, the openings 33' are brought into registry, with the openingsy 2611 and 36a, so that the powdermaterial may be sifted out of the box. I y

A cover 40v is provided-for the box. Said cover 40 comprises an outer oval-shaped tubular wall 41 of the i same dimension as the tubular wallA 12. The wall 41 .laaamrriiv Mar. 1s, 1.96.0 f

Wall 41 has a lower edge'42 which contactsthe' upper edge 14 of wall 12. The upper edge of wall 41 is in-V wardly rolled, .as Vat 42,y and frictionally tted within said wall"`41 'and contacting tlieunderside of lthe reanedge 42 is a top,cover ldisk `44 which isdisposed above theV inwardly rolled edge 19 whenl the cover is fully mounted on the box, `with `the edges 14 and, 42 mutually contacting.

The"top cardboard layer 27 is glued to the intermediate cardboard layer 28, which Yin turn is glued to -the paper sheet30, which as stated before is` glued to the bottom cardboard layer 26. It will now be observed that the cardboard layers, papersheet and valve disk 31 form a unit "which may be prefabricated and assembled with the sifterfbox. i 'A i' "It willthus be seenthat there is' provided an apparatus in ywhich the several4 objects of this invention are achieved and whichis welladaptedto meet the" coiidition'of practical use. f

AS possible. embodiments might :be made ef the above invention, and as various changes'might be made in the embodiment `above set forth,"it is to be understood that allY matter herein set forth or shownv in the accompanylng drawings is to be interpreted as illustrative and not in a limiting sense.

" l claim: V

1. `A sifter box having a sifter unit comprising a flat b ottom cardboard layer, a flat intermediate cardboard layer and a dat top cardboard layer, all Asuperimposed and having outer registering peripheries, the intermediate layer being formed with a'centra'l circular-opening, the top cardboard layer being formed with a central circular ripening smaller than the -tirst-mentioned circular openlng, the' bottom' cardboard layer being formed with a smaller opening eccentric with respect to theiirstmentioned openings, a valve disk rotatably mounted between the top and bottom cardboard layers and beingdisposed in the plane of'the intermediate cardboard layer, `said ,disk being formed with a plurality of spaced openings eccentric with respect to the disk, and adapted in one an- Agular position of the disk, to register with the opening in the. bottom cardboard laver, said box comprising a tirst tube having an inwardly extending. annular lower en'd flange, `a bottom wall fitted within the first tube and resting on said lower endiiange,l a second tube telescopedwithin said first tube and having a lower end rest- `mg on` thebottom wall, and an upper inwardly extending flange, a third tubertelescoped within the second tube and having a" lower end resting on said bottom wall, said lthirditube having an upperrim oniwhich the bottom ,cardboard layer seats, and said second tube having a top uannular ange engaging-over the rim of the top cardboard layerk clampingly securing said top, intermediate and bot-V tom layers randrhence, said disk in related assembly with saidtbox. n Y y s li Tlfhe combination of claim 1, in combination with a rpapersheet glued to the upper surface of the bottom cardboard layer, and being interposed between the mid- Ydleb.cardboardhlayer and the bottom cardboard layer, and sadvalve rdisk lying onsaid paper sheet. l j

3. The combination of claim 2, said cardboard layers and paper sheet :being glued together whereby said card,- -board layers,- sheet and valve disk form a unit.

4. A sifterrbox comprising a first tube having an in- '.wardlyrolled lower end fedge, a bottom wall fitted within said 'first ltube and.' resting on "said lower end edge, a

"an upper edge spaced below the inwardly rolled upper end edg of the second'tube, a 'sitter unit fitted Within the 'Y vwhichV said bottom cardboard layer rests, said second tube.

,second tube telescoped within ythe first tube Vand having a upper end of the second tube'and between the upper inwardly rolled endedge of the second tube and the upper end edge of thejthird tubei' said sifter unit comprising a bottom cardboard layer, anA intermediate cardboard layer and a top cardboard layer, the top cardboard layer being formed with an opening, the intermediate cardboard layer being formed with an opening concentric with the iirst opening and of larger diameter, and the bottom cardboard layer being formed with an opening eccentric with respect to the Viirst two openings butllying `within the periphery of the first opening, and a valve disk rotatably mounted between the top and bottom cardboard layers, the top cardboard layer overlapping the outer periphery of the disk, and said disk being formed with a plurality of outlet openings adaptedin one angular position of the disk to register with the opening in the bottom cardboard layer. 5. Ihe `combination of claim 4, inV combination with a papcrfsheet,'gluedtothe supper' surface of the'bottom cardboardlayer and being located between the' bottom and intermediate cardboardlayers, and said valve disk lying on said lpaper sheet, said paper sheet having an openingregistering with the opening in the bottom cardboard layer, `and jsaidV cardboard layers and sheet being glued together to form a unit which may be `prefabricatedwith the valve diskbefore assembling with said tubular members.

6. The combination of` claim 5, incombination with a Ycover telescopedv on theruppenend Vof the second tube and having an inwardly rolled upper end edge and a top wall fitted within the cover and contacting the underside'ofthe inwardly rolled Aupper end edge of said coverv "1; A sifter boxhaving a sifterunit comprising a dat bottom A cardboard` layer, a, flat intermediate cardboard layer and a at topgcardboard layer, alljsuperimposed andhaving outer registering peripheral edges, the intermediate-layer being formed withra central circular opening, the `top cardboardlayer being formed` with a central circular iopening smaller than the. first-mentioned `circular opening, the bottom cardboard layer being formedrwith a smaller opening eccentric with respect to the first-mentioned openings. a valve diskrotatably mounted between the topV and bottom vcardboard ,-layersl and being disposed in the plane of the intermediate cardboard laver, said disk being formed witha pluralitv of spaced openings eccentric-with respect to the. disk, and adapted in one V'the second tube and having a lower e'nd resting on said bottomk wall. said third tube havingan interior seat upon havinga portion surrounding said registering `peripheral edges and la portion overlying the rim Aofsaid vtopV cardb oard layerlclampingly securing sadunit against saidv f '8i Asifter box having fa sifter unit Vcomprising a tlat bottom `cardboard layer,` a 4flat intermediatmcardboard layer-and a flat top cardboard `layer,-f.all, superimposed `and having outer registering peripheral edges, the intermediate layer being formed with a central circular opening, the topV cardboard layer being formed with a central circular opening smaller than the first-mentioned circular opening, the bottom cardboard layer being formed with a smaller opening eccentric with respect to the rst-men- -tioned openings,`atvalve disk rotatably mounted between the top and bottom cardboard layers'and being disposed Ain the 'plane `ot the-,intermediate Vcardboard layer,` said disk being formed with a pluralityofspaced openings eccentric with respect to the disk,` anda'dapted in onean- 5 gular position of the disk, to register with the opening in the bottom cardboard layer, said box comprising a rst tube, a second tube within the first tube, and a third tube within the second tube, a bottom wall, means at the lower ends of the first tube to clamp the bottom wall to the lower ends of the second and third tubes, said second tube receiving and surrounding said registering edges, and means onthe second tube to clamp the sifter to the upper edge of the third tube.

CII

References Cited in the le of this patent UNITED STATES PATENTS Rollason Feb. Hoiman Nov. 15, 1938 Wells Apr. 15, 1947v Hoffman Aug. 23, 1949 FOREIGN PATENTS y Great Britain Feb 

